Be versing valve-geab



H. 0. BAKER.

REVERSING VALVE GEAR.

APPucATloN man MMM. 191s.

1,3 14,847. Patented Sept. 2,1919.

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` @me 055m@ z//mm H..0. BAKER.

REVER'SING VALVE GEAR. APPLxcATloN FILED MAY21. |918.

1 ,3 1 4,847 Patented Sept. 2, 1919.

3 SHEETS-SHEET 2.

H. 0. BAKER. nevfsme vALvl-i am.

APPLICATION FILED MAY 2l. |918.

Patented Sept. 2, 1919.

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una I rmx coLuMIIA PLANNJIIAPIIl co.. WASHINGTON. D. C.

l UNITED STATES PATENT FFICE.

HATLY o. BAKER, or" PUEBLO', coLoRAno.

nnvnnsme vA'LvEf-ennn.

To all whom 'ztmay concern:

Be it known that I, HARTLEY O. BAKER, a` citizen of the United States, residing at Pueblo, inthe countyof Pueblo and State of Colorado, have invented certainnew and useful Improvements in Reversing Valve- Gears; and'I do hereby declare the following to be a full, clear, and exactidescription of the invention, such as will yenable others skilledv in Lvthe fart to which it appertains to make and use the same.v

This invention Arelates to reversing valve gear and has for its object to provide a gearing" of this character for use in' connection withfeither single or multiple fluid pressure or expansion engines to operate andv reciprocate' thevalve'sfrornthev main crank movement without `the necessity of providing more than one eccentric for each cylinder used l`and at the Sametime eliminating the unsatisfactory valve link motion. p i

The principal objection to most reversing valve gear nowV in use isthat by its actuation, the mean position of the valve or valves over the port or ports' is distorted and drawn nearer the crank shaftv thereby destrylingv the Ll'ap' and lead features of the valve thus causing unequal distribution of the steam or otherpiuid on opposite sides of the piston. f i l To overcome this objection I have provided my valve gearing wherein the valve gear is mounted" on a bearing stationary with the engine frame and driven through' a train of gears which when rotated causes the valve gear to change its relation to the crank shaft without affecting or destroying any predetermined valve position as regards lap or lead or steam distribution on opposite sides of each piston.

With these and other objects in view as will appear as the description proceeds, the invention comprises the various other novel features of construction, combination and arrangement of parts as will be more fully described hereinafter and afterward specifically claimed.

Referring to the drawings:

Figure 1 represents a sectional plan View through a multiple cylinder steam engine with the reversing valve gear arranged in opposite positions.

Fig. 2 represents a diagrammatic sectional elevation taken on a plane indicated by the line 2--2 on Fig. 3.

Specification of Letters'atent.

Patented sept. 2, 1919.

y applicati@ fn'anay 21,1918. seriai 110.235.795.

Fig. 3 represents a front elevationy of the valve gear. Fig. 4 represents a sectional elevation of a modified form of valve gear taken 'on a plane indicated by the line 6-6 on Fig. 5, and

Fig. '5 represents a vertical sectional view taken on a plane indicated by the line 5-5 on Fig. 4. y' In order that the construction and operation of the invention may be readily comprehended by those skilled in the art to which the invention relates, I have illustrated the preferredy embodiment of my invention in the accompanying drawings and willnow proceed to fully describethe same in connection with said drawings, in which 1 are the fluid pressure cylinders, 2 the pistons therein, 3 the piston rods, 4 the cross heads connecting` the piston rods with the connecting rods 5, whichlatter are in turn connected to the crankpins 6 carriedby the cranks 7 mounted yon opposite ends of the engine crank shaft 8. The engine shaft is mounted in suitable bearings 9 supported by the engine frame' 10 mounted within and secured to the engine casing 11.` 12`.indcates `the slide 'valves for the cylinders 1 andare operated by valve rods 13.`

yTheengineframe'10 is provided with rearwardly' projecting hangers 14: in which are removably mounted axle bearings 15 that support the axles'l extending into'ith'e differential 17 which latter is provided with a driven gear 18.

The major portion of my reversing valve gear is mounted directly on the engine crank shaft and consists, in the preferred form, of a driving gear 19 directly meshing with the gear 18 of the differential and keyed upon the crank shaft so that motion can be transmitted to the rear axle. 20 is a yoke having its lower ends rotatably mounted upon the crank shaft and its upper end provided with an arm 2l to which a manually operable actuating rod is adapted to be connected.

A stub shaft 22 is journaled in the upper portion of the yoke and has a gear 23 keyed on it to mesh with the driving gear19. 24 is a gear integral with the gear 23 and also keyed on the shaft 22 and meshes with a gear 25 loosely mounted on the crank shaft. This gear 25 is integrally connected with a smaller gear 26 by a sleeve 27 journaled on the crank 'shaft and within- 'one arrnfoffthe yoke 20.

28 is an operating crank'gear meshing with` the gear 26 on the crank shaft and mounted-f1fr on a shaft 29 supported in a suitable bracket y30. An eccentric wheel 31 is mounted on f each side of the crankgear 28 and rigidly I Y connected therewith for rotation with it.

Eccentric straps 32 encirclethe-eccentrics 31 and are connected to the valve rods by crank rods j V From this construction it willbe readily apparent that by swinging the yoke 21 on the crank shaft the relative position of the slide -valves with respect to their' respective 'pistons can befreversedfat will without in anyway destroying the timing ofthe valves oridestroying the lap and lead whichinvariably cause Van unequal distribution of the fluid pressure' on each side of the piston.

It is to be further understood that this -re-V versing of the valve positions is accomplishedwithout in any way changing the ro-` lso tation ratioofrthe gears. s

In some instances it may be desirable to use'a slightlyrmodified form of valve gears' 'which as shown in Figs. and 5 consists of a yoke 34 providedV withan actuating arm 35. One arm 36 of the yokev is rotatably mounted on the Vcrank shaft' 3T while the otherparmBS is .somewhat Shorter and thas journaled'in itsxlower end a stubr shaft 39- Which carries a pinion 40 keyed to it. This pinion 40 meshes with an internal gear 41 carried by themain driving gear 42 keyed on the crankshaft 37 andwith a gear sleeve Llfloosely y-Inounted on the crank shaft. This'gear sleevexis adapted to be engaged and driven by .the valve crank gear28 andY its .associated parts as previously describedj in connection with the preferred form of the Copies` of this p'atent may be obtained for Vfive centseacli, by addressiiigtlie i Washington, IL10. Y

invention. The operationof this modied form of gearing is the'sarne as that previouysly described and likewise is designed to operate without changing the rotation ratio of thegears.

WhileI havey described Y*the Vprincipal Vof operation of the preferred embodiments of my invention I desire to have it understood i that such changes-iny construction and `Varrrangements of partsrmay Vbe made whende.-

Vsired as are within the scope "of. the-gap `pended claims.. c ai" 'Y Y I-Iavin 'thus'fully described'rmy invention 1 A valvev gear embodying a s haft,fa 'gear n named gear. yand one'gear ofthe sleeve, and Y.

a valve operating gear meshing with-the other gear ofthesleeve. Y ,i

2. A valvegear embr dying ashraftya gea-r secured thereon, a sleeve looseon thel shaft ends, a yokeV mounted for/oscillation onftlie shaft astridesaid gear lwithfone end'located betweenthe ends `of the sleeve, a rptaryinernber carried by fthe yoke within. the. same and gearedto the rst named gear and the ating vgear meshing withzthe other gear `of the sleeverv- Y ,j y c, n

In testimony whereof I `have signed ,my

two subscribing witnesses. r

Witnesses:r y: s .Y PAULINE SJlRowN,V n c FRONIEABELL;

HARTLE-v; -o. AKERQ Commissioner of latents,` `v

andhavin'ggears; thereon ataits, opposite adjacent gear of the sleeve,` and a valveropel'-,

name tothisspecication in the presence of p 

